We are currently having an extension built. The roof is going to be a flat roof with GRP covering, but there's some confusion about whether the structure of the roof is going to be a cold structure or a warm structure with regards to the insulation.
Can anyone shed some light on which is best with a GRP covering? Is one option more common than the other?
And, what are the pros and cons of a warm roof vs a cold roof in the context of GRP?
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